Visible crew/equipment: When the old ducks meet their new team member and then the Zamboni is crashed through the boards, you can easily see a fog machine set up in front of the Zamboni.
Visible crew/equipment: When the USA team is singing and skating down the streets and Coach Bombay is in the buggy, they all jump over the buggy and land successfully. But if you pause the movie you can see that the people skating are not actually the characters, they are the stunt doubles. Some of them are really funny cause they look nothing like the real characters.
Answer: There may be a number of reasons, but the most likely is that, if players work really well together, it makes sense to have them on the same line, regardless if they are both enforcers or not. To give an example, the 1990s Detroit Red Wings had the "Grind Line", which consisted of three forwards who were all known for their aggressive, physical style. The two wingers in particular were team enforcers. They meshed so well as a unit it wouldn't have been as effective to split them onto different lines, just to provide an enforcer to each. The combination of all three on one line worked very well, and other teams copied the format, though of course it was not unique to this team (see, for example, the Philadelphia Flyers' Legion of Doom).